Can I stack jars in the pot or in the pressure cooker?

There is no problem with stacking the jars in the pot or in the pressure cooker, as long there is a lid on the pot.

There is no problem with stacking the jars in the pot or in the pressure cooker, as long there is a lid on the pot.
The steam from the boiling water condenses on the surface of the jars as long they are colder than the boiling water and heats them up.